.... and add configure switch for it.
/etc might be on a read-only partition which is not suitable for dynamic
data such as the mixer settings. Hence move the location of asound.state
to /var/lib.
This is based on a patch from Ubuntu/Debian which hardcoded the pah in
/var/lib.
Signed-off-by: Lennart Poettering <mznyfn@0pointer.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Add minimal systemd and udev support to alsactl so that mixer settings
are restored at boot, when sound cards are plugged in and saved on
shutdown.
This is similar to existing udev/init script solutions in various
distributions.
Note that alsactl is called both synchronously from the udev rules as
well as asynchronously at boot. This is intended, and to ensure two
things:
- At boot the asound.state file might not be readable, since it resides
on a different file system. That means exclusively restoring sound card
settings from udev rules will no suffice, since if the rule is
executed at early boot (for example within udev settle) then the file
will no be readable and cannot be restored.
- We need to ensure that applications monitoring sound cards coming and
going (such as PA) must not get these events before the mixer settings
have been restored. That means the mixer settings must be restored
synchronously withing the udev rules, before the events are passed on
to the apps.
That basically means we need to restore the settings once in udev, to
deal with sound cards becoming available during runtime. And once in
early boot to deal with coldplugged soundcards whose data files might
not have been available at time of plugging. Hence we call alsactl
twice: one from the udev rule, and once from he systemd unit file.
Signed-off-by: Lennart Poettering <mznyfn@0pointer.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
- added -W/--wake option to reduce poll time
- another try to fix the avail_min parameter for playback
- fixed initial silence fill
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
In some cases it might be usefull to specify another CTL device names.
Add -X/--pctl and -Y/--cctl options.
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
- added workaround for alsa-lib (pthread configuration parsing issue) -
the workaround must be activated manually using ('--workaround serialopen')
- fixed avail_min initialization (caused high CPU usage or xruns)
- fixed shared buffer initialization (both capture and playback buffers
must have equal number of samples in this config)
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
alsaloop allows create a PCM loopback between a PCM capture device
and a PCM playback device.
alsaloop supports multiple soundcards, adaptive clock synchronization,
adaptive rate resampling using the samplerate library (if available in
the system). Also, mixer controls can be redirected from one card to
another (for example Master and PCM).
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
The inactive controls are stored, but they are not restored
when they are marked inactive in the state file or in the
driver.
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
alsaucm is a command line tool that can be used to generate and debug UCM
configuration files. The alsaucm utility can fully use the UCM functionality
to query and configure all the UCM functionality in alsa-lib.
This work was sponsored by Slimlogic Ltd, Texas Instruments Inc and Wolfson
Microelectronics PLC.
CC: Ian Molton <ian@mnementh.co.uk>
CC: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Justin Xu <justinx@slimlogic.co.uk>
Signed-off-by: Stefan Schmidt <stefan@slimlogic.co.uk>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
The term_c_lflag variable might be unitialized in some cases. Add extra
check to avoid setting of wrong value.
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Make the comment node a separate node in the state file (join=0), and
move it after the other fields of the respective control.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
When the range of a control has changed between driver versions, it is a
good idea to restore the same dB value of the control. However,
computing the dB value by interpolating betweem the min/max dB values
duplicates alsa-lib's TLV functions and does not even work for controls
with a linear dB range.
A simple conversion to dB and back can be done if we add the dB value(s)
to the saved state.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Reserving new space from the stack in every loop iteration is not
necessary, so move the call to snd_ctl_elem_id_alloca outside where it
is executed only once.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
To save a call to snd_config_set_xxx, replace the calls to
snd_config_make_xxx with snd_config_imake_xxx.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Also, make the initialization & restore logic for one card similar to
multiple card initialization & restore.
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Ensure that control volume values are in their allowed range; otherwise,
the displayed values could be outside the range 0..100 and mess up the
layout.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
